ICP Control Board Kit for RHS181H0AA0AAAA — Defrost/Heat Pump Control | Ships Today
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Overview
This OEM control board kit is the electronic brain of your ICP RHS181H0AA0AAAA heat pump's outdoor section. It manages the defrost cycle, reversing valve sequencing, compressor timing/anti-short-cycle delays, and fan operation based on inputs from the defrost thermostat and the indoor control. When the board fails, the heat pump loses the logic that keeps the outdoor coil ice-free in heating mode and protects the compressor between cycles. Boards typically fail from voltage surges, lightning, moisture intrusion, corroded relays, or burned solder traces around the relay contacts. Symptoms include a heat pump that won't defrost (heavy ice on the outdoor coil), no heating or no cooling, the compressor short-cycling, the reversing valve not switching modes, or no response at all from the outdoor unit. This kit ships as a complete OEM assembly so you replace the whole board rather than chasing individual relays.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Defrost / Heat Pump Control Board Kit |
| Brand | ICP (Heil / Tempstar) |
| Control Voltage | 24 VAC |
| Functions | Defrost timing, reversing valve, compressor delay |
| Fit | OEM Direct Replacement Kit |
Compatibility
Designed as a direct OEM fit for the ICP / Heil / Tempstar / Comfortmaker RHS181H0AA0AAAA heat pump. The 1183618 kit replaces the original defrost control assembly on this model and compatible RHS-series single-stage heat pumps. Confirm your unit uses a defrost control board (not a mechanical timer) before ordering.
Installation Guide
- Safety First — Shut off power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's electrical/control access panel.
- Document — Photograph every wire and connector on the board, noting terminal labels.
- Remove — Unplug the harness connectors and remove the board mounting screws or standoffs.
- Install — Mount the new board kit and reconnect each connector and wire exactly per your photo; set any defrost timing jumper to match the original.
- Test — Restore power and confirm normal heat, cool, and a forced or timed defrost cycle.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode
- No heat, no cool, or compressor short-cycling
- Reversing valve fails to switch between heat and cool
- Burnt smell, scorched relay, or corroded traces on the board
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days